南黄海强屏蔽层下富低频强能量气枪震源设计及应用

doi:10.11720/wtyht.2024.1166

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Abstract

A strong shielding layer exists between Neogene and Meso-Paleozoic strata in the South Yellow Sea Basin,hindering the downward propagation of seismic wave energy.Consequently,reflected seismic waves in deep strata manifest low energy and poor wave group characteristics,severely constraining the oil and gas exploration in Meso-Paleozoic strata.To enhance the imaging quality of Meso-Paleozoic strata under the strong shielding layer,this study proposed a method for designing a high-energy airgun source rich in low-frequency components through extensive simulation analyses at the excitation end of the source.Finally,a 6050 in³ high-energy airgun source rich in low-frequency components was designed and applied to the streamer-based seismic data acquisition in the extremely shallow water area in the western Laoshan uplift.The seismic data acquired in the deep strata under the strong shielding layer demonstrate significantly improved quality,exhibiting a higher signal-to-noise ratio,more continuous seismic events,and clearer structural characteristics.

Key words： South Yellow Sea strong shielding layer high capacity rich low-frequency component source design

Received: 24 April 2024 Published: 21 October 2024

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	Articles by authors
	Fu-Qiang HUANG
	Jian-Wen CHEN
	Bin LI
	Yi-Biao ZHANG
	Jia-Jia YANG
	Ke LI

Cite this article:

Fu-Qiang HUANG,Jian-Wen CHEN,Bin LI, et al. Design and application of a high-energy airgun source rich in low-frequency components under the strong shielding layer in the South Yellow Sea[J]. Geophysical and Geochemical Exploration, 2024, 48(5): 1294-1301.

URL:

https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.1166 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I5/1294

Source information used in the South Yellow Sea seismic survey project

Spectrum curves of seismic source wavelet with different sinking depth

Low frequency signal curves of single gun wavelet for four airgun types

Wavelet energy relationship curves of four types of airguns

Wavelet energy relationship curves of the same total capacity and different number of single guns

Wavelet energy statistics of cluster guns with different capacities

Wavelet energy comparison curves of cluster guns with different capacities

Layout diagram of the 6 050 in³ source

The far-field wavelet parameters of 6 050 in³ at different depths (6~12 m)

The far-field seismic wavelet of 6 050 in³ source in 7 m depth

The far-field seismic spectrum of 6 050 in³ source in 7 m depth

Main parameters of seismic acquisition in the western extremely shallow water area of Laoshan Uplift in 2022

Raw shot seismic record

The spectrum of raw shot seismic record

The spectrum comparison between 2009 seismic raw data and 2022 new seismic data

Comparison of PSTM under the same fold(60 times) between 2009 seismic raw data and 2022 new seismic data

Comparison of PSTM

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